DOCUMENT IMAGE FILING SYSTEM FOR FURNISHING ADDITIONAL MANAGERIAL INFORMATION FOR MANAGEMENT OF DOCUMENTS FILED IN THE SYSTEM

An image filing system in which additional document identification data is used in addition to main document identification data for the identification of an image-bearing document and is formulated typically on the basis of a predetermined relationship detected between the number of times which a given document has been searched for and the number of times which the document has been used for printing purposes so that the main document identification data assigned to the document and used for the searching of the document is deemed inappropriate depending on the resultant count numbers for displaying and printing whereupon a message to that effect is issued to prompt the operator of the system to change the keyword. There may be used another form of additional managerial information which relates to the period of time for which a given document is to be saved so that, when a given document is found to have been saved for a period of time longer than the period of time preliminarily registered, a message to that effect is displayed to prompt the operator to delete the control data for the particular document.